Skip to main content
Share Your Experience: Take the 2024 Developer Survey

Questions tagged [performance]

is for Emacs performance-related issues. Use additional tags to indicate which aspects of Emacs the performance issue is about: startup, navigation, search, screen updates, compilation, execution, debugging, and so on.

Filter by
Sorted by
Tagged with
0 votes
1 answer
49 views

magit slow with large files sitting around

I have six large .ipynb files in a git repo (100mb to 200mb each). They have diffs, but I don't want to check them in yet. The problem is that they seem to be the reason why magit becomes extremely ...
hjs's user avatar
  • 101
1 vote
0 answers
73 views

How to Troubleshoot Emacs?

These two questions 1 2 provide some tools to profile and debug emacs. But it doesn't explain exactly how to use those tools to figure out a problem with emacs. Once you have the profiling reports, ...
Daniel's user avatar
  • 121
1 vote
0 answers
56 views

projectile takes up 1 GB and makes everything slow

I added projectile a while back and it makes emacs bloat up memory from 25mb to about 1.16 GB and everything becomes very slow (loding emacs, saving files, opening new files, etc). I think it may be ...
Daniel's user avatar
  • 121
1 vote
1 answer
24 views

Unable to disable nor shrink recentf-mode

Loading recentf (180MB) makes emacs unusable recently. Simple M-x calls take almost a minute each and everytime I see a recentf related message. As others already asked I'm unable as well to disable ...
jjk's user avatar
  • 744
0 votes
1 answer
31 views

`tramp-verbose` setting has no effect on `*debug tramp*` buffer

Emacs 29.1, Tramp 2.6.0.29.1 I believe the log messages in the *debug tramp* buffer are slowing down TRAMP. With the tramp-verbose set to the default value of 1, my *debug tramp* buffer accumulated ...
Peter Becich's user avatar
0 votes
1 answer
31 views

Emacs freezes - Profiler shows three dots

Recently emacs freezes for multiple seconds, while process emacs --daemon -f exwm enable CPU usage goes up to 100%. I tried --debug-init instead of --daemon but still remain in the dark about the ...
jjk's user avatar
  • 744
1 vote
1 answer
33 views

textual edits of R script drives up R process cpu load (ESS)

I'm using ESS (emacs speaks statistics) to edit R code. Once the R process is running, every textual edit in the buffer imposes substantial computational demand onto the R process (which I see top in ...
swhalemwo's user avatar
1 vote
1 answer
55 views

Profiler/Benchmark Macro Like the `Time` in Common Lisp

To profile Elisp code, I tried benchmark.el and some profiler--prefixed built-in functions. But all their reports are either non-human-readable or inadequate. I think the ideal outcome is like what ...
shynur's user avatar
  • 5,318
0 votes
1 answer
35 views

Ignore tags during traversal in org-mode sparse tree match (performance)

I have a huge org file and I use the sparse tree function a lot to help me plan my weeks/months. (The agenda mode just doesn't do it for me; I really need to see it in the context of the tree.) ...
Ivan Perez's user avatar
0 votes
2 answers
480 views

Reducing Emacs Startup Time

I read that changing the default garbage collector settings is not recommended https://lists.gnu.org/archive/html/help-gnu-emacs/2007-06/msg00243.html however I noticed it can make an impact on the ...
Zoli's user avatar
  • 441
1 vote
1 answer
36 views

Timing a while loop

I am running two embedded loops that might take a long time. Would like to time the inner while loop. What can I do?
Dilna's user avatar
  • 1
4 votes
1 answer
135 views

Company Reftex slow when searching for labels

I am writing on a large LaTeX Document using Emacs with AUCTeX, RefTeX and Company for autocompletion. RefTeX for citations is working fine and finds my bibliography entries really fast. However, when ...
ls.ptr's user avatar
  • 61
2 votes
1 answer
199 views

Why is navigating in large `*shell*` buffer so slow?

For convenience (at least so far) I am running my program that produces a lot of debug output in Emacs shell. However I have a problem: Sometimes (not all the time) moving the cursor (up, down, left, ...
U. Windl's user avatar
  • 215
1 vote
1 answer
285 views

Slow start-up in MS Windows and relation to the Windows registry

I am using Doom in MS Windows with Emacs 27.2. I am experiencing some very slow start-up times (I included the output of benchmark-init/show-duration-tree at the end). Also, the first actions I ...
pgaluzio's user avatar
1 vote
0 answers
210 views

Debugging Issue: After Updating Emacs Input Lags Massively

After updating Emacs, I am seeing incredibly lagging input performance. I thought the slowness was due to LSP, but it seems to persist even when I disable LSP-mode. Unless I disable all major and ...
clo_jur's user avatar
  • 111
1 vote
0 answers
279 views

Scrolling through rust-lsp suggestions is very slow. How to go about debugging this?

I'm trying to set up Emacs with rust-lsp ( following this guide). The suggestions from the rust-analyzer are being picked up as you can see in the screenshot. But when I attempt to scroll through them ...
rtviii's user avatar
  • 113
0 votes
0 answers
136 views

What is causing slowness when pasting text to terminal emacs (emacs -nw)?

For work, I run terminal emacs inside tmux on a remote server, which I access via PuTTY on a Windows machine. (So far, I haven't found a better way to pickup where I left off when editing remote code.)...
nhaas's user avatar
  • 1
0 votes
1 answer
835 views

Emacs / Doom emacs taking a lot of memory

I'm using Doom Emacs, which is taking a lot of Memory if my browser is opened with 10 tabs. What can I do to reduce amount of memory being used, without sacrificing the packages? My config.el is as (...
Rajanboy's user avatar
  • 123
1 vote
0 answers
205 views

Really slow editing long org-mode blocks

When editing inside a long org-mode block (#+BEGIN_.... - #+END_....) Emacs is really slow (it can take several seconds to write a single character), while editing the rest of the buffer takes normal ...
DPD-'s user avatar
  • 251
1 vote
0 answers
198 views

How to speed up tramp with ivy

I use ivy for file and buffer completion. As soon as I have one (dired) buffer which gets its content via tramp from a (slow) remote server all buffer and file selection commands become very slow even ...
halloleo's user avatar
  • 1,345
3 votes
1 answer
1k views

Emacs is slow, intermittently hangs, freezes when I "come back to it", profiler says `savehist`

When I use Emacs it seems fine mostly, but since recently every couple of minutes it becomes extremely slow for a while. When I change focus to another app, and come back after a while, it is ...
hraban's user avatar
  • 211
1 vote
1 answer
509 views

Tramp mode - very slow connect

CentOS 7, Emacs 27.1 Suppose I wan to to connect to the remote host (by ssh). Approach#1 Opent Linux terminal and run the next command ssh [email protected] Type password and after about 3 ...
a_subscriber's user avatar
  • 4,124
5 votes
1 answer
871 views

Is there any way to get the memory size (usage) of a Lisp variable/value?

Basically sizeof for lists, hashmaps, etc., with nested structures. I could of course disable garbage collection and then compare numbers from memory usage functions before and after allocation, ...
aaa's user avatar
  • 446
0 votes
1 answer
268 views

Can't disable font-lock-mode

If I have font-lock on and I do M-x find-library RET simple RET, I have colours: If I then M-x font-lock-mode to disable the mode, the colours disappear in the currently-visible portion of the buffer:...
HappyFace's user avatar
  • 830
5 votes
1 answer
89 views

Is there an efficient way to tell which parts of my startup of Emacs take the longest to load?

I have been trying to make the start-up times better. Almost all of my init.el is broken into use-package declarations like this: (use-package x ...) (use-package y ...) (use-package z ...) I want to ...
scribe's user avatar
  • 1,035
2 votes
0 answers
114 views

Package autoloading and use-package

I'm a beginner on emacs and I don't understand packages autoloading and use-package. I see a lot of configs online which use 'use-package' and recommends installing packages with package manager (...
Rom's user avatar
  • 21
1 vote
0 answers
355 views

How can one debug a situation when emacs is unresponsive on Windows?

There is an operation in my setup which makes emacs unresponsive with high CPU. I checked the emacs process with process monitor, but it does not wait for an other process, so I guess it must be ...
Tom's user avatar
  • 1,260
1 vote
1 answer
727 views

What is causing Emacs remote shell to be slow on completion?

So basically I am doing the following: Opening a dired buffer with tramp on a remote. Opening a shell on the remote (M-x shell) Then if I try for example to type any command such as ls -la the ...
Juan Pablo Morales's user avatar
1 vote
1 answer
390 views

Slow markdown-mode as Emacs spends lots of time fontifying

Emacs on my Mac got upgraded when I upgraded some other package in Homebrew and now working with Markdown files is very slow. I'm now running the railwaycat/emacsmacport/emacs-mac package version with ...
kuzzooroo's user avatar
  • 301
2 votes
0 answers
425 views

EWW very slow opening of certain pages

This question was asked on stackoverflow. Just cross posting it here for better visibility. I am too facing the same issue. I'm using EWW Emacs browser for opening various remote pages(mostly ...
Kabira  K's user avatar
  • 103
2 votes
0 answers
44 views

Is (forward-char N)'s runtime complexity O(N)?

Internally, the text of a buffer is stored as a char array. The encoding used is based on UTF-8, which may use a variable number of bytes to represent different code points. Does the variable-length ...
alexgiorev's user avatar
5 votes
3 answers
3k views

Improve emacs performance when working on large files

I'm a former vim user that switched to emacs + evil with a still relatively simple configuration with only 36 packages. I'm really happy with the additional functionality emacs delivers, but one thing ...
enco909's user avatar
  • 51
0 votes
0 answers
600 views

Windows File open SLOW

Windows 10 Emacs 27.1 From C-x C-f File Till seeing the file actually open can take almost a minute! Tried emacs instead of runemacs. Also Menu-file-visit All the same I think there's some Mcafee ...
Rusi's user avatar
  • 333
1 vote
1 answer
61 views

How to improve ‘jedi‘ package's load time

When I try to use jedi package I get following message in the minibuffer. This feature requires the ‘jedi‘ package to be installed. Please check ‘elpy-config‘ for more information. Elpy Configuration ...
alper's user avatar
  • 1,380
3 votes
1 answer
82 views

What is the runtime complexity of using beginning-of-line?

I did a test where going to from the end to the beginning of a 50 million length line happens instantly when using beginning-of-line. I wonder if this is because it is a C primitive or because Emacs ...
alexgiorev's user avatar
1 vote
1 answer
441 views

How to diagnose emacs running at 100% cpu

I'm having a problem where occassionally emacs will run at 100% cpu, and just hang forever. I've attached gdb to the process, and this is the stacktrace: #0 0x00007fc210e5c5bb in pthread_sigmask () ...
Steve Lorimer's user avatar
1 vote
1 answer
141 views

How to measure the performance of the mode-line?

Currently when making changes to the mode-line, I try to write efficient elisp, However I don't know for sure if what I'm doing is in fact efficient. How could I test the mode-line performance? For ...
ideasman42's user avatar
  • 8,826
0 votes
0 answers
86 views

emacsclient spending a lot of time resetting faces

When I launch emacsclient or make a new frame it spends ~2s in: - make-frame 312 42% - frame-creation-function ...
Jamie Brandon's user avatar
2 votes
2 answers
3k views

Long Emacs start-up time (20~60s) on Windows 10

I have a working setup of emacs on Windows 10 that I like so far. However, I find that emacs start-up takes very long. It can be anywhere from 20s to 60s. I tried installing the benchmark-init package ...
archmuon's user avatar
  • 153
0 votes
2 answers
298 views

How to throttle or debounce an elisp method?

I have a very file system intensive function that's being called many times a second. Wish to slow things down a little, anyone knows a way to throttle that function call in elisp? [EDIT - 04/12/20]: ...
Henry Mazza's user avatar
1 vote
0 answers
196 views

Poor performance with Tabbar

Tabbar is refreshing groups like 14+ times at once (probably number of tabs) and causing severe slowness with the mods I made on it (lots of IO to sort tabs in mod time). What is the preferred way to ...
Henry Mazza's user avatar
0 votes
1 answer
189 views

Throttle transient-mark-mode highlighting?

When I'm using remote X forwarding to run X toolkit emacs and I press C-SPC and move the cursor around, things get very slow. The emacs profiler says all the time is spent in line-move-visual, but I ...
Joseph Garvin's user avatar
1 vote
1 answer
864 views

Why is emacs so bad at rendering long strings of text and what can be done to make it good?

Whenever a long string is to be rendered in an emacs buffer, which usually happens in the shell, emacs hangs and freezes, or takes too long to render the text compared to the terminal. What can be ...
Prikshet Sharma's user avatar
1 vote
0 answers
537 views

Debugging slow find-file performance

Trying to figure out why find-file (C-x C-f) operations are taking a long time on Windows 10 with emacs 26.3. I tried to do profiling and got following results. - command-execute ...
Nullpointer's user avatar
2 votes
1 answer
82 views

Troubleshooting a hanging `list-processes`

Normally I'd use M-x list-processes to see what Emacs is running in the background. But in this case list-processes itself hangs. What is the right thing to do in this situation?
Matthew Piziak's user avatar
5 votes
2 answers
171 views

How to pipe large files through fold before opening?

On a regular basis I need to open files that have really long lines, which unfortunately causes emacs to grind to a halt. My understanding is that this is a long-term issue with the renderer. I've ...
Joseph Garvin's user avatar
1 vote
0 answers
75 views

Performantly filter against a custom time-like property

My agenda view processes many items with SCHEDULED and DEADLINE fields, and fully generates from scratch in about 0.3s. However, if I append CUSTOM_SCHEDULED<"<now>" to my agenda view ...
Matthew Piziak's user avatar
1 vote
1 answer
258 views

Installation of Org-ref slows down start-up

I am super new to Emacs. I just followed the installation section of org-ref. I managed to get a simple citation working by adding bibliographystyle:plain to the file. This is one of the solution one ...
user1868607's user avatar
1 vote
0 answers
54 views

How are unrelated modes enabled?

I've been an emacs user for about a year now and I use it for Haskell programming. I chose to go the vanilla emacs route and customized a plain init file as I went along. Over time, however, I ...
Ashesh's user avatar
  • 121
1 vote
0 answers
727 views

Remove scrollbar, faster

I like a clean interface. One without the clutter of scroll bars, or menu bars. So, to remove them, I have the following in my init.el (progn (menu-bar-mode -1) (scroll-bar-mode -1) (tooltip-...
user1762507's user avatar